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CVE-2026-116566ModerateRevised 13 Nov

socket.getaddrinfo() accepts embedded null bytes in host and port

No KEV listing collectedCVSS not publishedFix not stated
MSRC advisory NVD CVE.org

Assessment

Severity
Moderate
CVSS base score
Not published
Impact
Not stated
Exploitation detected
Unknown: not stated by MSRC
Exploitability
Not assessed
Publicly disclosed
Unknown: not stated by MSRC
EPSS · 30-day forecast
No EPSS score collected
Customer action
Required: follow the MSRC remediation guidance
More details
Public detection template
No Nuclei template is listed in the current collected catalog
Component
Mariner
Weakness
CWE-158: Improper Neutralization of Null Byte or NUL Character
Issued by
PSF
Published
31 Oct 2026 · October 2026
Last revised
13 Nov 2026Information published.

Updates that fix it

0 KBs

No KB listed

No KB update is listed in the collected MSRC record. Check the MSRC advisory for product releases and other remedies.

Affected products

Open Source Software
3 affected products
  • azl3 python3 3.12.14-2 on Azure Linux 3.0
  • azl3 python3 3.12.16-1 on Azure Linux 3.0
  • azl3 python3 3.12.16-2 on Azure Linux 3.0

What changed

  1. Affected products: azl3 python3 3.12.14-2 on Azure Linux 3.0, azl3 python3 3.12.16-1 on Azure Linux 3.0 → azl3 python3 3.12.14-2 on Azure Linux 3.0, azl3 python3 3.12.16-1 on Azure Linux 3.0, azl3 python3 3.12.16-2 on Azure Linux 3.0
  2. Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  3. Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  4. Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  5. Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  6. Affected products: azl3 python-py 1.11.0-1 on Azure Linux 3.0, azl3 python3 3.12.14-2 on Azure Linux 3.0, azl3 python3 3.12.16-1 on Azure Linux 3.0 → azl3 python3 3.12.14-2 on Azure Linux 3.0, azl3 python3 3.12.16-1 on Azure Linux 3.0
  7. Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  8. Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  9. Affected products: azl3 python-py 1.11.0-1 on Azure Linux 3.0, azl3 python3 3.12.14-2 on Azure Linux 3.0 → azl3 python-py 1.11.0-1 on Azure Linux 3.0, azl3 python3 3.12.14-2 on Azure Linux 3.0, azl3 python3 3.12.16-1 on Azure Linux 3.0
Page history

Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.

Cite this version
Field-level log (30)

Up to 100 recent field edits are shown; older edits may be outside retention.

  1. 14 Nov 2026 · 08:16:23 UTC Last revised4 Nov 2026 01:45 UTC → 13 Nov 2026 14:54 UTC
  2. 14 Nov 2026 · 08:16:23 UTC Affected productsazl3 python3 3.12.14-2 on Azure Linux 3.0, azl3 python3 3.12.16-1 on Azure Linux 3.0 → azl3 python3 3.12.14-2 on Azure Linux 3.0, azl3 python3 3.12.16-1 on Azure Linux 3.0, azl3 python3 3.12.16-2 on Azure Linux 3.0
  3. 13 Nov 2026 · 12:10:20 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  4. 13 Nov 2026 · 12:10:20 UTC Source coverage: public-exploit-codeIncomplete → Current
  5. 13 Nov 2026 · 12:10:20 UTC Source coverage: first-epssIncomplete → Current
  6. 13 Nov 2026 · 12:10:20 UTC Source coverage: msrc-cvrfIncomplete → Current
  7. 13 Nov 2026 · 11:07:20 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  8. 13 Nov 2026 · 11:07:20 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  9. 13 Nov 2026 · 11:07:20 UTC Source coverage: first-epssCurrent → Incomplete
  10. 13 Nov 2026 · 11:07:20 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  11. 6 Nov 2026 · 17:32:22 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  12. 6 Nov 2026 · 17:32:22 UTC Source coverage: public-exploit-codeIncomplete → Current
  13. 6 Nov 2026 · 17:32:22 UTC Source coverage: first-epssIncomplete → Current
  14. 6 Nov 2026 · 17:32:22 UTC Source coverage: msrc-cvrfIncomplete → Current
  15. 6 Nov 2026 · 16:31:02 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  16. 6 Nov 2026 · 16:31:02 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  17. 6 Nov 2026 · 16:31:02 UTC Source coverage: first-epssCurrent → Incomplete
  18. 6 Nov 2026 · 16:31:02 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  19. 4 Nov 2026 · 08:19:44 UTC Last revised1 Nov 2026 14:59 UTC → 4 Nov 2026 01:45 UTC
  20. 4 Nov 2026 · 08:19:44 UTC Affected productsazl3 python-py 1.11.0-1 on Azure Linux 3.0, azl3 python3 3.12.14-2 on Azure Linux 3.0, azl3 python3 3.12.16-1 on Azure Linux 3.0 → azl3 python3 3.12.14-2 on Azure Linux 3.0, azl3 python3 3.12.16-1 on Azure Linux 3.0
  21. 2 Nov 2026 · 17:30:39 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  22. 2 Nov 2026 · 17:30:39 UTC Source coverage: public-exploit-codeIncomplete → Current
  23. 2 Nov 2026 · 17:30:39 UTC Source coverage: first-epssIncomplete → Current
  24. 2 Nov 2026 · 17:30:39 UTC Source coverage: msrc-cvrfIncomplete → Current
  25. 2 Nov 2026 · 16:27:39 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  26. 2 Nov 2026 · 16:27:39 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  27. 2 Nov 2026 · 16:27:39 UTC Source coverage: first-epssCurrent → Incomplete
  28. 2 Nov 2026 · 16:27:39 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  29. 2 Nov 2026 · 09:04:36 UTC Last revised31 Oct 2026 01:01 UTC → 1 Nov 2026 14:59 UTC
  30. 2 Nov 2026 · 09:04:36 UTC Affected productsazl3 python-py 1.11.0-1 on Azure Linux 3.0, azl3 python3 3.12.14-2 on Azure Linux 3.0 → azl3 python-py 1.11.0-1 on Azure Linux 3.0, azl3 python3 3.12.14-2 on Azure Linux 3.0, azl3 python3 3.12.16-1 on Azure Linux 3.0

Explore global source statements, affected packages and advisory history for CVE-2026-116566. The catalog has a separate collection scope from Microsoft release records.

More advisories, affected versions and source history

Exploitation and risk

Source status

CISA KEV lists vulnerabilities known to be exploited. FIRST EPSS estimates the likelihood of exploitation in the next 30 days. An unavailable score does not mean zero risk.

Which CVEs have scores here?

This view includes predictions for CVE identifiers explicitly listed in public NuGet advisories. Microsoft release pages have their own prediction coverage. Check source status for the scope and latest checks.

No exploitation or prediction data is available here for these CVEs. This does not mean they are safe or unlikely to be exploited.

cve-program · CVE-2026-116566

Published

socket.getaddrinfo() accepts embedded null bytes in host and port

socket.getaddrinfo() previously accepted null bytes within *host* and *port* parameters which can cause the values to be silently truncated.

Source published
29 Oct 2026 17:45:47 UTC
Source modified
30 Oct 2026 17:18:15 UTC
Saved here
30 Oct 2026 18:45:26 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 4.0 · 5.3 CVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

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